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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efc6f6eadabde1786dbd17885ec2b4a72a477aa6909a1e0e4ebc2237cdc81f03' 
  AND token = 'mWBnNKRLZa2Y40zyazqLu+pwVVWx7VAcUOAMSt6IBNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}